将UIButton添加到AVCaptureVideoPreviewLayer？

Question

我想在AVCaptureVideoPreviewLayer中添加UIButton或其他类型的按钮。

以下是我的尝试：

[self.view.layer addSublayer:_videoPreviewLayer];
UIButton * sButton = [[UIButton alloc] initWithFrame:CGRectMake(10, 0, 300, 100)];
[sButton setBackgroundColor:[UIColor yellowColor]];
[sButton setTitle:@"Stop" forState:UIControlStateNormal];
[sButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[_videoPreviewLayer addSublayer:sLabel.layer];
[_captureSession startRunning];

我也尝试过添加类似UIView的东西，即使AVCapture没有启动也是如此。但是，我无法在该视图中添加子视图。

Answer 1

参加派对的时间已经很晚了，但我一直在做类似的事情，所以我想我会分享：

UIButton * btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(200, 200, 100, 50);
[btn setTitle:@"Hello, world!" forState:UIControlStateNormal];
[btn setBackgroundColor:[UIColor blueColor]];
[btn becomeFirstResponder];
UIAccessibilityPostNotification(UIAccessibilityScreenChangedNotification,  btn);
[self.view addSubview:btn];